CN101242634B - Service providing system, device and method - Google Patents

Abstract

The embodiment of the invention discloses a service providing system and a device, which ensure that a CS network side call branch can be established between UE and CSA; the CSA and the S-CSCF can establish an IMS network side call branch between the CSA and the S-CSCF for the UE. The embodiment of the invention also discloses a service providing method, which comprises the following steps: registering for the UE in the CS network; registering for the UE in the IMS network; and establishing a CS call leg between the UE and the IMS network. The service providing system, the device and the method of the embodiment of the invention can support the UE to access the IMS service platform through the CS network, and can effectively reduce the cost.

Description

A service provision system, device and method

technical field

The present invention relates to the communication field, in particular to a service providing system, device and method. the

Background technique

Currently, the mobile communication network is mainly circuit-switched (Circuit-Switched, CS), including GSM, CDMA, and the like. Each operator has established a relatively complete and rich service platform based on the CS network. The service provision of the CS network needs the support of the mobile switching center (MSC) in the roaming area, which is not conducive to the introduction of new services. IP Multimedia Sub-system (IP Multimedia Sub-system, IMS) is a service network based on IP switching. Its service provision has nothing to do with the roaming area, which is conducive to the introduction of new multimedia services. IMS supports user terminals (UE) through various packet switching The access network performs IMS multimedia services. the

Because the IMS network is a relatively complex network, the overall deployment of the IMS network will not be completed in a short period of time, which makes the CS network coexist with the IMS network for a certain period of time. In this case, for a new service, the operator may need to create two service platforms on the CS network and the IMS network for this service, resulting in increased construction and operation costs. It can be seen that in terms of reducing costs and promoting smooth evolution to the IMS network, it is very necessary to provide a technology for UE to access the IMS service platform through the CS network, but there is no such technology provided yet. the

Contents of the invention

In view of this, the main purpose of the embodiments of the present invention is to provide a service provision system and method to support UE access to an IMS service platform through a CS network and effectively reduce costs. the

Another object of the embodiments of the present invention is to provide a service provision device to support UE access to an IMS service platform through a CS network, thereby effectively reducing costs. the

In order to achieve the above object, the technical solution of the embodiment of the present invention is achieved in this way:

A service provision system, the system includes a UE registered in a CS network, including an S-CSCF located in an IMS network, and also includes a circuit switching domain adapter; at least one of the UE, the S-CSCF, and the CSA is used to initiate UE registration in the IMS network, the HSS in the IMS network is used to provide UE user configuration data during the registration process of the UE to the IMS network;

During the communication process, the UE and the CSA are used to establish a CS network side call leg. the

A service provision method, the method comprising:

Register for the UE in the CS network;

At least one of the UE, S-CSCF, and CSA initiates the registration of the UE in the IMS network, and registers the UE in the IMS network;

A CS call leg is established between the UE and the IMS network. the

A service providing device, which includes a UE-side call processing module connected to each other, a UE-side registration module and a UE-side communication module, any one of which is used to store the address information of the CSA;

Wherein, the UE-side communication module is used to transfer bidirectional authentication information and call establishment information between UE and S-CSCF;

The UE side registration module is used to initiate the registration of the UE in the IMS network, and realize the IMS registration of the CS access technology;

The UE-side call processing module is configured to establish a CS network-side call branch between the UE and the CSA

A service providing device, the device includes a CSA side call processing module connected to each other, a CSA side registration module and a CSA side communication module;

Wherein, the CSA side communication module is used to transfer the two-way authentication information between the UE and the S-CSCF and the transfer of the call establishment information;

The CSA side registration module is used to initiate the registration of the UE in the IMS network, and realize the IMS registration of the UE;

The CSA side call processing module is used to establish a CS call branch between the UE and the IMS network. the

Compared with the prior art, the system, device and method provided by the embodiments of the present invention can support the UE to access the IMS service platform through the CS network, and can effectively reduce the cost. the

Description of drawings

Fig. 1 is the network architecture diagram of the service providing system of the embodiment of the present invention;

Fig. 2 is a flow chart of a method for UE to register in IMS according to an embodiment of the present invention;

Fig. 3 is another method flow chart that UE registers in IMS in the embodiment of the present invention;

FIG. 4 is a flow chart of another method for UE to register in the IMS according to an embodiment of the present invention;

FIG. 5 is a flowchart of another method for UE to register in the IMS according to an embodiment of the present invention;

Fig. 6 is a flow chart of a method for realizing incoming call delivery according to an embodiment of the present invention;

Fig. 7 is a flow chart of a method for obtaining a circuit switching domain routing number (CS Domain Routing Number, CSRN);

Fig. 8 is another method flowchart of obtaining CSRN;

Fig. 9 is a flow chart of another method for realizing incoming call delivery according to an embodiment of the present invention;

FIG. 10 is a flow chart of a method for implementing UE calling in an embodiment of the present invention;

Figure 11 is a flow chart of another method for realizing UE calling in an embodiment of the present invention

FIG. 12 is a device structure diagram of a UE according to an embodiment of the present invention;

Fig. 13 is a device structure diagram of a CSA according to an embodiment of the present invention. the

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. the

The service providing system provided by the embodiment of the present invention includes a UE registered in the CS network, including an S-CSCF located in the IMS network, and also including a CSA; at least one of the UE, the S-CSCF, and the CSA is used to initiate the UE For registration in the IMS network, the HSS in the IMS network is used to provide UE user configuration data during the registration process of the UE to the IMS network; during the communication process, the UE and the CSA are used to establish a CS network side call leg. the

The service provision method provided by the embodiment of the present invention includes: registering the UE in the CS network; registering the UE in the IMS network; establishing a CS call branch between the UE and the IMS network. the

A service providing device provided by an embodiment of the present invention includes a UE-side call processing module, a UE-side registration module, and a UE-side communication module connected to each other, any one of which is used to store the address information of the CSA; wherein, The UE-side communication module is used to transfer bidirectional authentication information and call establishment information between UE and S-CSCF; the UE-side registration module is used to implement IMS registration of CS access technology; the UE-side call processing A module, configured to establish a CS network-side call leg between the UE and the CSA. the

Another service providing device provided by an embodiment of the present invention includes a CSA-side call processing module, a CSA-side registration module, and a CSA-side communication module connected to each other; wherein, the CSA-side communication module is used to transfer UE and S-CSCF The transfer of two-way authentication information and call setup information; the CSA side registration module is used to implement the IMS registration of the UE; the CSA side call processing module is used to establish a CS call branch between the UE and the IMS network . the

Referring to FIG. 1, FIG. 1 is a network architecture diagram of a service providing system according to an embodiment of the present invention. In Figure 1, P-CSCF: is the first connection point relative to the user in the IMS, providing proxy functions (such as accepting and forwarding service requests, but cannot modify the Request URI field in the INVITE message; P-CSCF also It can provide user agent (UA) functions, such as interrupting or independently generating SIP sessions under abnormal conditions. 

S-CSCF: S-CSCF is in the core control position in the IMS core network, responsible for UE registration authentication and session control, and performs basic session routing functions for calling and called IMS users; The IMS triggers the rules, and when the conditions are met, the value-added service routing to the AS is triggered and the service control interaction is performed. the

I-CSCF: Similar to the gateway node of IMS, it provides the functions of S-CSCF allocation, route query and IMS inter-domain topology hiding functions for users of the network. the

HSS: A centralized and comprehensive database that stores the subscription information of IMS users in the home network, located at the top layer of the IMS core network architecture; the subscription information usually includes: basic identifiers, routing information, and service subscription information. The HSS includes the HLR function, and the HLR is the home location register of the CS network, including the service information of the home subscribers. the

Application Server (Application Server, AS): provides IP multimedia value-added services for IMS users, which can be located in the user's home network or provided by a third party. the

MGCF: Realize the interaction between IMS core control plane and PSTN or CS network, support ISUP/BICC and SIP protocol interaction and call intercommunication, control IMS-MGW through H.248 to complete PSTN or CS network TDM bearer and IMS network user plane RTP Convert in real time. the

IMS-MGW: Complete IMS, PSTN and CS network user plane intercommunication and necessary codec conversion. the

BGCF: According to the configuration of the interworking rules or the called party analysis, select the MGCF and the BGCF of another network for the call from the IMS to the PSTN/CS. the

VMSC/VLR: MSC is the call and service control center of the CS network, VMSC refers to the remote MSC; VLR is the visitor location register, which is used to save the location information of all users in the current control area. the

USSDC and SMSC are the message centers of USSD and SMS respectively, and both can communicate with CSA through SMPP protocol. The aforementioned USSD and SMS are respectively one of the CS network data transmission paths. the

CSA, as a newly introduced network element, its functions include: assisting the UE to register with IMS; controlling the delivery of incoming calls to the CS domain; controlling the main call to enter the IMS network, and sending the call to the S-CSCF for call and session processing. the

In principle, a UE under the coverage of a CS network (GSM/UMTS/CDMA, etc.) will perform IMS registration and indicate that the UE adopts a CS access technology, and the IMS network will assign an S-CSCF to serve the UE. During the IMS registration process, the operations performed by the S-CSCF generally include: registering a CSA address, the call for the UE will be delivered through the CS network, and the call will be forwarded to the CSA; and at least one public address needs to be registered. User identity (Public SubscribeIdentity), so that when other users call the registered public user identity, the call can be established; during the call process, it is necessary to obtain user configuration data from the HSS, and perform subsequent processing on the established call according to the configuration data. the

The following describes in detail the implementation of UE registration in the IMS, control of sending incoming calls to the CS domain, and control of UE primary calls entering the IMS network. the

Referring to Fig. 2, Fig. 2 is a flow chart of a method for the UE to register in the IMS according to an embodiment of the present invention, and the process includes the following steps:

Step 201: After the UE is registered in the CS network, the HSS sends a Push-Profile-Request (PPR) to the S-CSCF in the IMS network. The push description request includes UE's private user identity and user configuration data, and the user configuration data includes a newly set "CS network registered" (CS-registered) parameter. the

Step 202: The S-CSCF saves the private user identity and user configuration data from the HSS, and can confirm that the UE has registered in the CS network according to the CS-registered parameter; and, the S-CSCF sends a push description response to the HSS (Push- Profile-Answer, PRA). the

Step 203: If the S-CSCF has not obtained complete user configuration data, the S-CSCF sends a Service Assignment Request (Server-Assignment-Request, SAR) to the HSS. The service allocation request includes UE's private user identity and public user identity to indicate which S-CSCF will serve the UE (private user identity), and requests to download specified user configuration data from the HSS. the

Step 204: The HSS sends the requested user configuration data to the S-CSCF in a Server-Assignment-Response (SAR). the

The above user configuration data includes at least one CSA address, and at least one CSA address is stored in the S-CSCF. The Diameter protocol is used between the S-CSCF and the HSS. the

Of course, if the UE performs CS de-registration, the HSS indicates "CS-deregistered"; correspondingly, the S-CSCF deletes the user configuration data of the UE. the

In practical applications, the CSA may also initiate the registration as shown in FIG. 3 . Referring to FIG. 3, FIG. 3 is a flow chart of another method for UE to register in the IMS according to an embodiment of the present invention, and the process includes the following steps:

Step 301: The CSA sends a Subscribe-Notification-Request (SNR) to the HSS, and the Subscribe-Notification-Request includes the public user identity of the UE and the subscription data. the

Step 302: The HSS sends a Subscribe-Notification-Answer (SNA) to the CSA to confirm that the subscription is successful. the

Usually, the CSA will subscribe to the data information of the specified user to the HSS. When some data of the specified user is updated, the HSS can send the changed data to the CSA, so that the CSA can know when the subscribed data occurs. Variety. the

Step 303: After the UE registers with the CS, the HSS sends a Publish-Notification-Request (PNR) to the CSA, and the Publish-Notification-Request includes "CS-registered" data and a public user identity. the

Step 304: When receiving a request to send a Publish Notification from the HSS, the CSA sends a Publish-Notification-Answer (PNA) to the HSS to indicate confirmation. the

Step 305: The CSA finds the private user identity of the UE according to the received public user identity, then generates a SIP registration (SIPRegister) request containing the private user identity and the public user identity requesting registration, and sends the SIP registration request through the I- The CSCF or directly sends it to the S-CSCF, requesting IMS registration for the UE, and instructing the use of CS access technology. the

Step 306: S-CSCF sends a service assignment request (Server-Assignment-Request, SAR) to HSS, the service assignment request includes UE private user identity and public user identity, and indicates which S-CSCF will serve the UE (private user identity), and also request to download the user configuration data of the specified UE from the HSS. the

Step 307: The HSS sends the requested user configuration data to the S-CSCF in a Server-Assignment-Response (SAR). the

Step 308: The S-CSCF receives and saves the user configuration data from the HSS, and returns a 200 OK message to the CSA, indicating that the registration is successful. the

Of course, if the UE de-registers with the CS, the CSA de-registers with the IMS, and the S-CSCF deletes the user configuration data of the UE. the

The operation process of the registration initiated by the CSA may also be as shown in FIG. 4 . Referring to FIG. 4, FIG. 4 is a flow chart of another method for the UE to register in the IMS according to an embodiment of the present invention, and the process includes the following steps:

Step 401: The CSA receives the mobility management notification message sent by the VLR through the CAMEL mechanism, and the message indicates that the UE is "IMSI attached", that is, the UE has completed CS registration. the

Step 402: The CSA generates a SIP registration request, and sends the SIP registration request to the S-CSCF through the I-CSCF or directly to the S-CSCF, requests IMS registration, and indicates the use of CS access technology. the

Step 404: The S-CSCF sends a service allocation request to the HSS, which contains the UE's private user identity and public user identity, and indicates which S-CSCF will serve the UE (private user identity), and also requests to download the specified UE from the HSS. User configuration data of the UE. the

Step 404: The HSS sends the requested user configuration data to the S-CSCF in the service allocation response. the

Step 405: The S-CSCF receives and saves the user configuration data from the HSS, and returns a 200 OK message to the CSA, indicating that the registration is successful. the

In practical application, as shown in Fig. 5, the UE may also initiate the registration. Referring to FIG. 5 , FIG. 5 is a flowchart of another method for UE to register in the IMS according to an embodiment of the present invention. In Figure 5, it is assumed that Tom uses an IMS terminal (hereinafter collectively referred to as UE), Tom has two public user identities, namely SIP URI: tomhome.cn, Tel URI: +8615912345678; Tom's home domain is home.cn; private user The identity is privatehome.cn; the SIP address of a CSA serving Tom is csa.home.cn; the USSD service code is 121; the SIP address of the S-CSCF in the user's home domain is scscf1.home.cn. the

When the UE held by Tom enters the coverage area of the CS network, the UE initiates IMS registration according to the following steps. the

Step 501: After the UE successfully initiates the IMSI Attach process under the CS network, the UE reads the relevant parameters and the preset USSD service code, forms a USSD Request and sends it to the network. The USSD Request message includes the following contents:

USSD service code: 121

Attributable domain name: home.cn

Public user identity to register: Tel URI: +8615912345678

Private user identity: privatehome.cn

The USSDRequest request message is routed to a CSA of the UE's home IMS network through the MSC/VLR and HLR according to the service code for processing, and a USSD connection is established between the UE and the CSA. the

Step 502: After receiving the USSD request, the CSA extracts the relevant information of the IMS registration to form a SIP registration request:

REGISTER sip:home.cn SIP/2.0

Via: SIP/2.0/UDP sip:csa.home.cn; branch＝0pctb

Path: csa.home.cn

From: <+8615912345678>; tag＝pohja

To: <+8615912345678>

Contact: <tel:+8615912345678>; expires=60000

Call-ID: apbafadsa34dsa542

CSeq: 25 REGISTER

Authorization: Digest username="privatehome.cn",

realm = "home.cn",

nonce="",

uri="sip:home.cn",

response=""

Afterwards, the CSA resolves the home domain name (or has already configured the I-CSCF address) through DNS, obtains the address of an I-CSCF in the user's home domain, and forwards the SIP registration request to the I-CSCF; when the SIP registration request reaches the I-CSCF After the CSCF, the I-CSCF inquires whether the HSS has completed the IMS registration, if registered, obtains the S-CSCF address serving the UE; if not, the I-CSCF allocates an S-CSCF, and then sends the SIP registration request sent to the S-CSCF. Alternatively, the CSA directly sends a SIP registration request to the S-CSCF, and the address of the S-CSCF may be saved in the CSA or received from the UE. the

Step 503: The S-CSCF serving the UE downloads an authentication vector (Authentication Vector, AV) from the HSS according to the Username parameter contained in the received SIP registration request. The authentication vector includes a random number (RAND), an expected response value (XRES), an encryption key (CK), an integrity key (IK), an authentication token (AUTN) and the like. the

Step 504: The S-CSCF serving the UE composes a SIP 401 (unauthorized) message, and returns the message to the CSA along the route of the SIP registration request. The nonce message header in the SIP registration request contains AUTN and RAND parameters. the

The content of the SIP 401 message usually includes:

SIP/2.0401 Unauthorized

From: <+8615912345678>; tag＝pohja

To: <+8615912345678>; tag＝gasba

Contact: <tel:+8615912345678>; expires=60000

Call-ID: apbafadsa34dsa542

CSeq: 25 REGISTER

WWW-Authenticate: Digest realm="home.cn"

    nonce＝A34Cm+Fva37UYWpGNB34JP 

Algorithm＝AKAv1-MD5

ik="0123456789abcdeedcba9876543210"

ck="9876543210abcdeedcba0123456789"

Step 505: After the CSA accepts the SIP 401 (unauthorized) message, the response code, nonce, and algorithm (algorithm) parameters in the message are encapsulated in the USSD response, and the USSD response is sent to the UE through the USSD connection. And, the CSA extracts and saves the IK and CK parameters in the SIP 401 (unauthorized) message. the

Step 506: After the UE receives the USSD message from the CSA, it extracts the authentication token and the random number from the nonce of the message; it knows that the serial number (SQN) between the HSS and the ISIM is in a synchronized state through the authentication token, and determines The SIP 401 message is indeed sent by the home domain of the UE, thus completing the authentication to the network. the

Based on the received random number and shared key, the UE generates the response value (RES) required for the response; and, the UE generates another USSD request and sends it to the CSA, which includes the following:

Attributable domain name: home.cn

Public user identity to register: +8615912345678

Private user identity: privatehome.cn

nonce: A34Cm+Fva37UYWpGNB34JP

RES: 6629fae49393a05397450978507c4ef1

Step 507: After receiving the USSD request from the UE, the CSA converts the request into a SIP registration request:

REGISTER sip:home.cn SIP/2.0

Via: SIP/2.0/UDP sip:csa.home.cn; branch＝2pctb

Path: csa.home.cn

From: <+8615912345678>; tag＝ulkomaa

To: <+8615912345678>

Contact: <tel:+8615912345678>; expires=60000

Call-ID: spnafadsa34d49222

CSeq: 43 REGISTER

Authorization: Digest username="privatehome.cn",

realm = "home.cn",

    nonce＝A34Cm+Fva37UYWpGNB 34JP, 

uri="sip:home.cn",

response="6629fae49393a05397450978507c4ef1"

Afterwards, the CSA resolves the home domain name (or has already configured the I-CSCF address) through DNS, obtains the address of an I-CSCF in the user's home domain, and forwards the SIP registration request to the I-CSCF; when the SIP registration request reaches the I-CSCF After the CSCF, the I-CSCF inquires whether the HSS has completed the IMS registration, if registered, obtains the S-CSCF address serving the UE; if not, the I-CSCF allocates an S-CSCF, and then sends the SIP registration request sent to the S-CSCF. Alternatively, the CSA directly sends a SIP registration request to the S-CSCF, and the address of the S-CSCF may be saved in the CSA or received from the UE. the

Step 508: The S-CSCF serving the UE compares the received response value with the XRES in the AV, and determines that the UE has been successfully authenticated when the two parameters are identical. the

After the authentication is successful, the S-CSCF serving the UE downloads the user configuration from the HSS through the Cx interface;

The S-CSCF serving the UE records the IMS registration information of the UE:

Public user identity of UE for IMS registration: +8615912345678;

UE's contact address: +8615912345678;

IMS Registration Status: Registered;

Access technology for IMS registration: CS access;

CSA address: csa.home.cn. the

Step 509: The S-CSCF serving the UE composes a 200 OK response message, and returns the message to the CSA along the route of the SIP registration request. the

SIP 200 response message:

SIP/2.0 200 OK

From: <+8615912345678>; tag＝ulkomaa

To: <+8615912345678>; tag＝kotimaa

Contact: <tel:+8615912345678>; expires=60000

Call-ID: spnafadsa34d49222

CSeq: 43 REGISTER

Service-Route: origsip:scscf.home.cn

Content-Length: 0

Step 510: After receiving the 200OK response message from the S-CSCF, the CSA extracts and stores the origsip:scscf.home.cn address included in the Service-Route header of the 200OK response message. the

At the same time, the content of the response code 200OK message is encapsulated in the USSD message, and the message is sent to the UE through the USSD connection. the

Through the above steps, Tom's UE has completed the IMS registration of the CS access technology; thus, Tom can obtain the IMS service based on the CS network through the UE. the

Usually, you can communicate with a CSA through USSD/SMS, and perform IMS registration through the CSA. When registering, the UE needs to report the private user identity and the public user identity it wants to register, and the UE and the S-CSCF can perform mutual authentication. In addition, during the registration process, the CSA and the UE can negotiate a SIP compression algorithm (currently using the RFC3320 standard), and then the CSA and the UE will transmit compressed SIP messages to reduce the burden on the USSD/SMS bearer of the CS network. the

After the IMS registration is completed, the UE that has already registered in the CS network can access the IMS service platform through the CS network; at this time, the future call can be sent to the UE in the CS domain (as shown in Figures 6 and 9 As shown), it is also possible to control the calling of the UE to enter the IMS (as shown in Figures 10 and 11). the

Referring to Fig. 6, Fig. 6 is a flow chart of a method for realizing incoming call distribution according to an embodiment of the present invention, and the process includes the following steps:

Step 601: The INVITE message from the calling end located in the IMS network arrives at the S-CSCF. the

Step 602: The S-CSCF forwards the invitation message to the CSA according to the CSA address registered during IMS registration. In practical applications, the S-CSCF may change the RequestURI (Uniform Resource Identifiers, URI) of the invitation message from a SIP URI to a Tel URI (Tel URI). the

Step 603: The CSA obtains the CSRN, and sets the Request URI in the invitation message as the CSRN. the

Step 604: The CSA sends the invitation message to the MGCF through the BGCF. the

Step 605: The MGCF generates an Initial Address Message (Initial Address Message, IAM) message according to the received invitation message, and sends the message to the VMSC. the

Step 606: When receiving the initial address message from the MGCF, the VMSC sends a Setup (Setup) message to the UE, indicating that the call has arrived. the

Step 607: The UE answers the call by sending a connect (Connect) message to the VMSC. the

Step 608: The VMSC generates an answer message (ANM) and sends it to the MGCF, indicating that the UE has answered the call. the

Step 609 to Step 611: The MGCF generates a 200 OK message, and sends the 200 OK message to the CSA through the BGCF, and the CSA sends the 200 OK message to the calling end through the S-CSCF. the

Step 612 to Step 614: the calling end responds to the MGCF with an acknowledgment (ACK) message through the CSA as an acknowledgment for the call. the

There are many ways to obtain CSRN described in Figure 6 (as shown in Figures 7 and 8):

Referring to Fig. 7, Fig. 7 is a flow chart of a method for obtaining CSRN, the process includes the following steps:

Step 701: The CSA sends a routing information message to the HLR through the existing C interface of the CS network in a manner of simulating the operation of the GMSC/VMSC, and the message carries the UE number (MSISDN). the

Step 702: When receiving the sending routing information message from the CSA, the HLR sends a providing roaming number (Provide Roaming Number, PRN) message to the VLR to obtain the MSRN number. the

Step 703: The VLR assigns an MSRN number to the UE, and returns the MSRN number to the HLR in a provision roaming number acknowledgment (PRN-Ack) message. the

Step 704: The HLR sends the received MSRN number to the CSA through the C interface for storage; and, in subsequent operations, the MSRN number will be used as the CSRN number. the

Referring to Figure 8, Figure 8 is a flow chart of another method for obtaining CSRN, the process includes the following steps:

Step 801: The CSA sends a subscription notification request to the HSS/HLR through the existing Cx interface of the IMS network, and the subscription notification request includes the public identity of the user and the subscription data. the

Step 802: The HSS/HLR sends a subscription notification response to the CSA to confirm that the subscription is successful. the

Step 803: The HSS/HLR sends a roaming number provision message to the VLR to acquire the MSRN number. the

Step 804: The VLR allocates an MSRN number to the UE, and returns the MSRN number to the HSS/HLR in a response message of providing a roaming number. the

Step 805: The HSS/HLR carries the received MSRN and sends it to the CSA in a release notification request, which may include "CS-registered" data. the

Step 806: The CSA saves the received MSRN, and uses the MSRN number as a CSRN number in subsequent operations; and, the CSA sends a release notification response to the HSS/HLR to indicate confirmation. the

Referring to FIG. 9, FIG. 9 is a flow chart of another method for realizing incoming call delivery according to an embodiment of the present invention, and the process includes the following steps:

Step 901: The invitation message from the calling end located in the IMS network arrives at the S-CSCF. the

Step 902: The S-CSCF forwards the invitation message to the CSA according to the CSA address registered during IMS registration. In practical applications, the S-CSCF may change the RequestURI (Uniform Resource Identifiers, URI) of the invitation message from a SIP URI to a Tel URI. the

Step 903: The CSA allocates an Internet Protocol Multimedia Routing Number (IP MultimediaRouting Number, IMRN), and sends the IMRN to the UE through a USSD Request (USSD Request) supporting USSD/SMS. Of course, the CSA can also deliver the calling number (Calling Phone Number, CgPN), so that the UE may decide whether to perform follow-up response and other operations according to the received CgPN. the

Step 904: UE responds to the call by sending a USSD response (USSD Response) to the CSA. the

Step 905: The UE initiates a call on the CS network by sending a setup message through the received IMRN, and the call will be routed to the VMSC. the

Step 906: The VMSC generates an IAM message carrying the IMRN, and sends the IAM message to the MGCF. the

Step 907: The MGCF generates an invitation message carrying the IMRN, and sends the invitation message to the CSA through the I-CSCF. the

Steps 908 to 909: The CSA searches for the corresponding calling number CgPN according to the received IMRN and the saved ISDN of the UE, and sends the generated 200 OK message to the calling terminal through the S-CSCF according to the found CgPN. the

Step 910 to Step 911: the calling end responds to the CSA with an ACK message through the S-CSCF as confirmation. the

Step 912: The CSA generates a 200 OK message and sends it to the MGCF, indicating that the call setup is complete. the

Step 913: The MGCF generates an ANM message and sends it to the VMSC, indicating that the call setup is complete. the

Step 914: The VMSC sends a connect message to the UE, indicating that the call setup is complete. the

Step 915: When the MGCF receives the 200 OK message, it responds with an ACK message to the CSA as a call establishment confirmation. the

Referring to FIG. 10, FIG. 10 is a flow chart of a method for realizing UE calling in an embodiment of the present invention, and the process includes the following steps:

Step 1001: UE initiates a call to VMSC through CS network. The method of initiating the call is usually that the UE sends a setup message to the VMSC. the

Step 1002: VMSC sends an initial detection point (Initial DP, IDP) message to CSA (where gsmSCF is set). the

Step 1003: The CSA obtains the called number from the received IDP message and saves it; moreover, the CSA allocates an IMRN, and returns the IMRN in the connection message to the VMSC. the

Step 1004: The VMSC generates an IAM message carrying the IMRN and sends it to the MGCF, and the called number in the message is filled as the IMRN. the

Step 1005: The MGCF generates an invitation message containing the IMRN according to the received IAM message, and sends the invitation message to the CSA through the I-CSCF. the

Steps 1006 to 1007: The CSA searches for the corresponding called number CdPN according to the received IMRN and the saved ISDN of the UE, sets the found called number as the Request URI, and sends the invitation message carrying the CdPN It is sent to the called end through the S-CSCF. the

Step 1008 to Step 1010: The called end answers the call by sending a 200OK message, etc., and the 200OK message reaches the MGCF via the S-CSCF and CSA (where gsmSCF is set). the

Step 1011: MGCF generates ANM message and sends it to VMSC, indicating that the call is answered. the

Step 1012: VMSC generates a connect message and sends it to UE, indicating that the call is answered. the

Step 1013 to Step 1015: As a confirmation, the MGCF generates an ACK message and sends it to the CSA; the CSA sends the received ACK message to the called end through the S-CSCF. the

Referring to FIG. 11, FIG. 11 is a flow chart of another method for implementing UE calling in an embodiment of the present invention. The process includes the following steps:

Step 1101: the UE sends a USSD request message carrying the called number CdPN to the CSA. the

Step 1102: The CSA saves the CdPN included in the received USSD request message; and, the CSA allocates an IMRN, and returns the USSD response message carrying the IMRN to the UE. the

Step 1103: UE initiates a CS call to VMSC according to the received IMRN. The method of initiating the call is generally: the UE sends a setup message carrying the IMRN to the VMSC. the

Step 1104: The VMSC carries the received IMRN in an IAM message and sends it to the MGCF, and the called number in the IAM message is filled as the IMRN. the

Step 1105: The MGCF carries the received IMRN in the generated invitation message, and sends the invitation message to the CSA through the I-CSCF. the

Step 1106 to Step 1107: The CSA searches for the corresponding called number CdPN according to the received IMRN and the saved ISDN of the UE, and sets the found called number as the Request URI, and sends the invitation carrying the CdPN The message is sent to the called end through the S-CSCF. the

Step 1108 to Step 1110: The called end answers the call by sending a 200OK message, etc., and the 200OK message reaches the MGCF via the S-CSCF and the CSA. the

Step 1111: MGCF generates ANM message and sends it to VMSC, indicating that the call is answered. the

Step 1112: VMSC generates a connect message and sends it to UE, indicating that the call is answered. the

Step 1113 to Step 1115: As a confirmation, the MGCF generates an ACK message and sends it to the CSA; the CSA sends the received ACK message to the called end through the S-CSCF. the

In practical applications, in order to ensure that the CSA can support the UE to access the IMS service platform through the CS network, the settings shown in Figure 12 and Figure 13 need to be performed in the UE and the CSA respectively. the

Referring to FIG. 12 , FIG. 12 is a device structural diagram of a UE according to an embodiment of the present invention. In FIG. 12 , the UE includes a UE-side call processing module, a UE-side registration module, and a UE-side communication module that are connected to each other. the

Wherein, the communication module on the UE side is used for transferring bidirectional authentication information and call establishment information between the UE and the S-CSCF. The UE side communication module may be a USSD or SMS application module, or other CS network data communication application modules. The communication module on the UE side can also save the address information of the CSA (in fact, the address information can be saved in any module included in the UE). The registration module on the UE side is used to implement the IMS registration of the CS access technology, such as: reporting the private user identity and public user identity to the CSA; in addition, the UE side registration module can also send the UE private user identity and public user identity to the CSA, and also IMS authentication operations, two-way authentication operations, etc. can be performed. In practical applications, the registration module on the UE side generally communicates with the CSA through the communication module on the UE side. The UE side call processing module is responsible for establishing a call from the CS network into the IMS network (the call is for the CS network side call leg between the UE and the CSA), and usually an S-CSCF performs session processing for the call. the

Referring to FIG. 13 , FIG. 13 is a device structure diagram of a CSA according to an embodiment of the present invention. In FIG. 13 , the CSA includes a CSA-side call processing module, a CSA-side registration module, and a CSA-side communication module that are connected to each other. the

Among them, the CSA side communication module is used to transfer the two-way authentication information and call establishment information between UE and S-CSCF; the CSA side communication module can be a USSD or SMS application module, or other CS network data communication application modules. The CSA side registration module is used to perform IMS registration on behalf of the UE to realize the IMS registration of the CS access technology, such as: sending a registration request to the S-CSCF, saving the S-CSCF address allocated for the UE and at least one public user identity of the UE, etc. . The CSA side call processing module is used to establish the CS network side call leg between the UE and the CSA, including sending the request related to the call to the S-CSCF and the UE, the call enters the IMS network through the CS network, and is usually handled by an S - The CSCF performs session handling for the call. the

It can be seen from the above description that the system, device and method provided by the embodiments of the present invention support the UE to access the IMS service platform through the CS network, which can effectively reduce the cost. the

Claims (26)

1. A service providing system is characterized in that the system comprises a user terminal UE registered in a circuit switching CS network, an S-CSCF positioned in an IP multimedia subsystem IMS network, and a circuit switching domain adapter CSA; a CS network side management entity is connected between the UE and the CSA, and the CS network side management entity is a visiting place mobile switching center (VMSC) and a Media Gateway Control Function (MGCF) which are connected;

at least one of the UE, the S-CSCF and the CSA is used for initiating the registration of the UE in the IMS network; the S-CSCF is used for acquiring user configuration data of the UE in the registration process of the UE to the IMS network, and registering at least one public user identity and at least one CSA address of the UE; the HSS in the IMS network is used for providing UE user configuration data in the registration process of the UE to the IMS network; the UE registers an IMS network and indicates the UE to adopt a CS access technology, and the IMS network allocates an S-CSCF to serve the UE;

in the communication process, the UE and the CSA are used for establishing a CS network side call branch; the CSA controls the incoming call to be sent to the CS domain, controls the main call to enter the IMS network, and sends the call to the S-CSCF to carry out call and session processing; the S-CSCF forwards the call aiming at the UE to the CSA, and the controlling the main call to enter the IMS network comprises the following steps: the CSA allocates an IP multimedia routing number IMRN, the UE sends the call to the CSA through the IMRN, and the CSA sends the call to a called end in the IMS network through the S-CSCF.

2. The system of claim 1, wherein in implementing the IMS network registration S-CSCF, CSA, the S-CSCF is configured to actively request the UE user configuration data from HSS; the HSS is used for providing the UE user configuration data requested by the S-CSCF to the S-CSCF.

3. The system of claim 1, wherein in an S-CSCF, CSA, used to perform the IMS network registration, the CSA is used to trigger the S-CSCF to request the UE user configuration data from the HSS after the UE completes a CS registration; and the HSS is used for providing UE user configuration data to the S-CSCF according to the request of the CSA after learning that the UE is registered in the CS network.

4. The system of claim 1, wherein in an S-CSCF, CSA, used to perform registration with the IMS network, the CSA is used to trigger the S-CSCF to request the UE user configuration data from the HSS after learning that the UE is registered in the CS network; the HSS is used for providing UE user configuration data to the S-CSCF according to the request of the CSA.

5. The system of claim 1, wherein the UE is to bi-directionally authenticate with the S-CSCF via the CSA; the S-CSCF is used for requesting the UE user configuration data to the HSS after passing the authentication; and the HSS is used for providing UE user configuration data to the S-CSCF according to the request of the S-CSCF.

6. The system according to any of claims 1 to 5, wherein in case of establishing the CS network side call leg, the CSA is configured to obtain a circuit switched domain routing number, CSRN, for the UE and to inform the UE of a call from the IMS network according to the CSRN; the UE is used for answering the call and informing CSA;

under the condition of establishing the IMS network side call branch, the S-CSCF is used for sending the call in the IMS network to the CSA; the CSA is configured to accept the call.

7. The system according to any of claims 1 to 5, wherein in case of establishing the CS network-side call leg, the CSA is configured to allocate an Internet protocol multimedia routing number, IMRN, to the UE and to inform the UE of a call from the IMS network in accordance with the IMRN; the UE is used for answering the call and informing CSA;

under the condition of establishing the IMS network side call branch, the S-CSCF is used for sending the call in the IMS network to the CSA; the CSA is configured to accept the call.

8. The system according to any of claims 1 to 5, wherein in case of establishing the CS network side call leg, the UE is configured to inform the CSA through a connected CS side network management entity that a call is to be initiated; the CSA is used for distributing the IMRN for the UE and triggering the CS side network management entity to initiate a call carrying the IMRN for the UE according to the IMRN;

under the condition of establishing the IMS network side call branch, the CSA is used for converting the IMRN from the UE into a corresponding called number CdPN and sending a call carrying the CdPN to the S-CSCF; the S-CSCF is to accept the call from CSA.

9. The system according to any of claims 1 to 5, wherein in case of establishing the CS network side call leg, the UE is configured to request an IMRN from the CSA and send the received IMRN to the CSA in a call; the CSA is used for allocating IMRNs for the UE according to the request of the UE and receiving calls from the UE;

under the condition of establishing the IMS network side call branch, the CSA is used for converting the IMRN from the UE into a corresponding called number CdPN and sending a call carrying the CdPN to the S-CSCF; the S-CSCF is to accept the call from CSA.

10. A service providing method, comprising:

registering for a user terminal UE in a circuit switched CS network;

initiating registration of the UE in an IP Multimedia Subsystem (IMS) network by at least one of the UE, the S-CSCF and the circuit switched domain adapter (CSA), and registering the UE in the IMS network;

establishing a CS call leg between said UE and the IMS network, including the CSA sending a request relating to a main call to the S-CSCF and the UE, the call entering the IMS network through the CS network, session processing being performed for the call by the S-CSCF, said establishing a CS call leg between said UE and the IMS network including: an S-CSCF in an IMS network sends an invitation message aiming at the call to a CSA, the CSA acquires a circuit switching domain routing number CSRN, the call from the IMS network is sent to a VMSC of a visited mobile switching center of a CS network according to the CSRN, and the VMSC sends the call to UE; or S-CSCF in IMS network sends invite message aiming at the call to CSA, the CSA distributes IP multimedia routing number IMRN and sends the IMRN to UE, the UE initiates CS call to CSA according to the received IMRN; or the CSA allocates an IP multimedia routing number IMRN, the UE sends the call to the CSA through the IMRN, and the CSA sends the call to a called end in the IMS network through the S-CSCF;

the registering for the UE in the IMS network includes: indicating the UE to adopt a CS access technology, and allocating an S-CSCF to the IMS network to serve the UE; the S-CSCF acquires the user configuration data of the UE, registers at least one public user identity and at least one CSA address of the UE, and forwards the call aiming at the UE to the CSA;

in the communication process, the CSA controls the incoming call to be sent to the CS domain, controls the main call to enter the IMS network, and sends the call to the S-CSCF for call and session processing; the S-CSCF forwards the call for the UE to the CSA.

11. The method of claim 10, wherein the S-CSCF is configured to obtain the user configuration data of the UE by:

and the HSS pushes the user configuration data of the UE to the S-CSCF, and simultaneously pushes the private user identity of the UE to the S-CSCF.

12. The method of claim 10, wherein the S-CSCF is configured to obtain the user configuration data of the UE by:

the HSS receives a user configuration data request from the S-CSCF, and then sends the requested user configuration data to the S-CSCF.

13. The method of claim 10, wherein prior to the S-CSCF obtaining the user configuration data for the UE, further comprising:

the CSA sends a SIP REGISTER request to the S-CSCF.

14. The method of claim 13, wherein prior to the CSA sending the SIP registration request, further comprising:

CSA sends subscription notification request to HSS, the request includes UE user public identity and subscription request data; the HSS sends a release notification request containing the registered data of the CS network to the CSA after learning that the UE carries out CS network registration; the CSA generates the SIP register request.

15. The method of claim 13 wherein the CSA sends the SIP registration request by:

the CSA sends the SIP REGISTER request to the S-CSCF through the I-CSCF.

16. The method of claim 13, wherein the SIP registration request includes a private user identity of the UE and a public user identity requesting registration.

17. The method of claim 13, wherein prior to the CSA sending the SIP registration request, further comprising:

and the CSA receives the mobility management notification sent by the VLR through a CAMEL mechanism, learns that the UE completes CS network registration according to the message, and generates the SIP registration request.

18. The method of claim 13, further sending, by a UE, a private user identity and a public user identity requesting registration to the CSA.

19. The method of claim 18, wherein the UE and the S-CSCF are further bi-directionally authenticated with the CSA.

20. The method according to claim 18 or 19, wherein the mutual authentication information and the private user identity and the public user identity requesting registration are transmitted over a CS network data transmission path.

21. The method of claim 20 wherein the CS network data transmission path is unstructured supplementary data service, USSD, or short message service, SMS.

22. A service providing device is characterized in that the device comprises a user terminal UE side call processing module, a UE side registration module and a UE side communication module which are connected with each other, wherein any one of the modules is used for storing the address information of a circuit switching domain adapter CSA;

the UE side communication module is used for transmitting bidirectional authentication information and call establishment information between the UE and the S-CSCF;

the UE side registration module is used for initiating registration of the UE in an IP multimedia subsystem IMS network and realizing IMS registration of a CS access technology; the UE side registration module is communicated with the CSA through the UE side communication module;

and the UE side call processing module is used for establishing a CS network side call branch between the UE and the CSA.

23. The apparatus of claim 22, wherein the UE-side communication module is an unstructured supplementary data service, USSD, or short message service, SMS, application module, or other CS network data communication application module.

24. The apparatus of claim 22, wherein the UE-side registration module is further configured to send a UE private user identity and a public user identity to the CSA and to perform a mutual authentication operation.

25. A service providing apparatus, comprising a CSA-side call processing module, a CSA-side registration module, and a CSA-side communication module, which are connected to each other;

the CSA side communication module is used for transmitting the bidirectional authentication information and the call establishment information between the user terminal UE and the S-CSCF;

the CSA side registration module is used for acting the UE to perform IMS registration of the IP multimedia subsystem to realize IMS registration of a circuit switching CS access technology;

the CSA side call processing module is used for establishing a CS call branch between UE and an IMS network, and comprises the steps of sending a request related to a main call to S-CSCF and UE, enabling the call to enter the IMS network through the CS network, and carrying out session processing on the call by one S-CSCF, wherein the step of establishing the CS call branch between the UE and the IMS network comprises the following steps:

the S-CSCF forwards the invitation message to the CSA according to the CSA address registered during IMS registration; CSA obtains the route number CSRN of the circuit switching domain, and set Request URI in the invite message as CSRN; the CSA sends the invitation message to a media gateway control function MGCF through an exit gateway control function BGCF; MGCF generates initial address message according to received invitation message, and sends the initial address message to VMSC; when receiving the initial address message from MGCF, VMSC sends the establishment message to UE;

or,

the CSA allocates an IP multimedia routing number IMRN, the UE sends the call to the CSA through the IMRN, and the CSA sends the call to a called end in the IMS network through the S-CSCF.

26. The apparatus of claim 25, wherein the CSA-side communication module is an unstructured supplementary data service, USSD, or short message service, SMS, application module, or other CS network data communication application module.

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